FIXED: In CPView, the transformation matrix was set at each drawing pass, even if the matrix was the identity matrix.

Now we check if the highDPI ratio is == 1 and skip the setTransform call in this case.

AppKit/CPView.j

@@ -2594,7 +2594,7 @@ setBoundsOrigin:
     }
 
 #if PLATFORM(DOM)
-    if (_needToSetTransformMatrix)
+    if (_needToSetTransformMatrix && _highDPIRatio !== 1)
         [_graphicsContext graphicsPort].setTransform(_highDPIRatio, 0, 0 , _highDPIRatio, 0, 0);
 #endif